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That did it. &nbsp;I had an entry in our relay for the subnet of the 2010 server! &nbsp;UGH!
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I have implemented a new exchange 2013 box into co-existence with a 2010 exchange box. &nbsp;Email is flowing into both sides, but anything going to the old 2010 box will not pass through to the 2013 anymore. &nbsp;It was working, but now it all queues up and I get a nonexistent domain error in the queue. &nbsp;Any ideas? &nbsp;I have attached the error.<br />
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Capture.JPG

I have implemented a new exchange 2013 box into co-existence with a 2010 exchange box.  Email is flowing into both sides, but anything going to the old 2010 box will not pass through to the 2013 anymore.  It was working, but now it all queues up and I get a nonexistent domain error in the queue.  Any ideas?  I have attached the error.

exchange 2010 not passing email to exchange 2013

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.